Grinding machine



Y l 624,642 April 12 1927 A. vUlLLEUMn-:R y

GRINDING MACHINE Filed May 16. 1923 Patented Apr. 12, 1927.

PATENT OFFICE.

.ALBERT VUILLEUMIER, 0F BRISTOL, CONNECTICUT, ASSIGNOR T0 THE NEW D-PARTURE MANUFACTURING COMPANY, 0F BRISTOL, CONNECTICUT, A CORPORA- TIONOF CONNECTICUT.

GRINDING MACHINE.

Application filed May 16,

This invention relates to grinding machines and is herein shown asembodied in a machine for grinding` balls. l

In machines of this class it has been customary to employ grinding discshaving Y grooves in which the' balls are received and ground. Naturally,in such machines, the grooves wear deeper as the discs are continued inuse, so that it has been necessary to stop the operation of the machinefrom time to time and dress down the faces of the'ribs at the sides ofthe grooves in order to prevent the grooves becoming so deep that theyperform little or no grinding. The

discs are heavy and their separation for the` purpose of subjecting themto the action of suitable dressing tools is laborious anda source ofdelay and expense.

An object of the invention, therefore, is to provide means for effectingthe dressing of abrading discs with a minimum amount of labor, delay-and expense. A further object is to provide improved means foreffecting the dressing operation on a ball grinder without disassemblingthe parts of the grinder. Still another object is to provide improvedmeans for effecting the dressing operation without the necessity forusing an special dressing or truing tools.

.n the illustratedv construction, a lixed disc and a rotary disc havingcooperating ball grooves are provided and provision is made for movingone of the discs into engagement with the other so that the mutualrubbing effects the truing operation. Preferably, one of the discs has abearing in an eccentric bushing by means of which it can be moved out ofaxial alignment with the of the ribs with one another is a. combinedlengthwise and crosswise rubbing such that the ribs are accuratelyre-surfaced.

To these ends and also to improve .generall upon devices of thecharacter indicate my invention consists in the various mattershereinafter described and claimed.

Referring to the drawings, Figure 1 is a which is held against rotationin a suitable standard. The disclO has a plurality of 1923. serial No.639,227.

concentric ball grooves 14 between which lie the intervening ribs orlands 16. An abrasive disc or ring 18 having corresponding ball groovesand intervening ribs is detachably carried by the circular plate 20, thehub of which, as shown at 22, is threaded onto the cnd of a hollowspindle 24, driven by the pulley 26 which is keyed to the spindle asindicated at 28.

A Surrounding the spindle are the single row bearmg and the double rowbearing' 30 and 32, respectively` these being spaced by t-he.sleeve 34.The bearings are mounted in an'eccentric bushing .36 which is turnablycarried by the standard or frame 38, a ange 40 on the bushing extendingoutwardly and limiting the movement of the bushing in one direction. Aplate 42 attached tothe other end vof the bushing 36 prevents its axialAmovement in the other direction.

When the balls are in rocess of being ground, the parts are in t erelative positions lndlc'ated in the drawings. When the ribs are to berie-surfaced, the disc 18 isv engaged by a worm 46 carried by a horinzontal shaft r48 journaled in the standard and having a hand wheel 50 bywhich it may be turned.v The normal alignment of the discs is preservedby means of a locking wedge and notch shown best in Figure 2.

- The notch 52 has inclined sides arranged l other disc.. Consequently,the engagement* to t the inclined sides of the wedge 54 40 Vand looselyconnected to the wedge bymeans' of a collar 60 set into-a circularrecess in the wedge. This wedge insures the re-positioning of the discsin accurate axial alignment after the facing or truing operation.

The disc 10, which is held against rotation, engages the ballsyieldingly during the grinding operation. For .this purpose a coilspring 62,is placed inside the Isleeve 64 of the plate 12 and isinterposed between the plate and an abutment (not shown) at the los`operation is performed.

other end of a rod 66. The rod 66 holds the discs against separation andpasses through the hollow spindle 24, a nut 68 and washer 70 being fixedto one end. Upon removal of the `nut and washer, the shaft 66 isremovable endwise through the discsfor the purpose of allowing thenecessary lateral movement of 'the disc 18 when the truing In vsomecases, enough clearance may be left between the rod 66 and the spindle24; to allow the lateral movement without removing the rod. To provide ayieldingA engagement between the discs durin the truing or dressing oeration, the fo lowing mechanism is provlded for constantly pressing thedisc 10 against its companion disc. vRack teeth 72 are formed on the hubsleeve 64 and are engaged by a pinion 74, the shaft of which may besquared to receive an arm 7 6 and the arm is yieldingly pulled in onedirection by a spring 7 8 fixed to the end of the arm and t0 a fixedpart of the frame. A

It is believed that the operation of the device is clearly apparent fromthe above description. Although the invention has been described andclaimed by referring to a specific machine, it should be understood,that, in its broader aspects, the invention is not necessarily limitedto the apparatus selected for illustration.

I claim:

1. In a ball grinding machine, in combination, a disc, means forrotating the disc, a second dise held against rotation, one of saiddiscs having ball grooves with intervening ribs, and means forrelatively moving the discs to cause one disc to engage the ribs on theother for dressing the latter, sub stantially as described.

2. In a ball grinding machine, in combination, a disc having ballgrooves with intervening ribs, a second disc having similar ball grooveswith intervening ribs, means for causing a relative rotary movementbetween the discs to grind the work, and means for4 relativelydisplacing the discs to cause the ribs of one disc to engage with theribs of the other for dressing the latter, substantially as described.

3. In a ball grinding machine, in combination,'a disc' having concentricball grooves with intervening ribs, a second ,disc in axial alignmentwith the first and having similar ball grooves with intervening ribs,means for rotating one of the .discs to grind the work, and means formoving one of the discs out of axial alignment with the other to causethe ribs on the two discs to mutually cross each other, substantially asdescribed.

4. In a ball grinding machine, in combination, a disc having ballgrooves with intervening ribs, a second disc having similar ball grooveswith intervening ribs, means for rotating one of the discs togrind thework, and an eccentric sleeve furnishing a laterally movable support forone of said discs, substantially as described.

5. In a ball grinding machine, in combination, a .disc having ballgrooves with intervening ribs, a second disc having similar ball grooveswith intervening ribs, means for rotating one of the discs to grind thevwork, a support for one of said discs, and means for laterally movingsaid support, substantially as described.

6. In a ball grinding machine, in combination, a disc having ballgrooves with intervening ribs, a second disc having similar ball grooveswith intervening ribs, means for rotating one of the discs to grind thework, an eccentric sleeve furnishing a laterally movablev support forone of said discs, means for turning said sleeve, and means for lockingsaid sleeve in normal position.

7 In a ball grinding machine, in combination, a disc having ball grooveswith intervening ribs, a second disc having similar ball grooves withintervening ribs, means for` rotating one of the discs, a spring foryieldingly pressing the work between the discs, and a second spring foryieldingly pressin one of the discs against the other to grin one discby contactwith the other, substantially as described.

8. In a grinding machine, in combination, a disc, means for rotating thedisc, a cooperating non-rotary disc, means for yieldingly pressing oneof said discs against the other for grindingone disc by contact with theother, and independent means for yieldingly pressing the workbetween thediscs, substantially as described.

9. In a grinding machine, in combination, a disc havlng concentricgrooves, means for rotating the disc, a cooperating disc held againstrotation, a rack and pinion for sliding said last named disc towards theother disc, and yielding mean-s tending to turn the\ pinion to effect agrinding contact betweenl the disks, substantially as described.

In testimony whereof I hereunto aiiix my signature.

ALBERT VUILLEUMIER.

